Elastic-fluid turbine.



0. JUNGGREN. IIIIIIIIIIIIIIIIII E.

Inventor": Oscardun r-en by 2?,

' H is fitter-neg.

Pat nted May 21,1918.

UNITED STATES PATENT OFFICE.

OSCAR JUNGGREN, OF SGHENEGTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRICCOMRAN'Y, A CORPORATION OF NEW YORK.

ELASTIC-FLUID runnmn.

Specification of Letters Patent.

Patented May 21, 1918.

Application filed December 4, 1917. Serial No. 205,455.

To all whom it may concern:

Be it known that 1, Oscar: JUNGGREN, a citizen of the United States,residing at Schenectad in the county of Schenectady, State of ew York,have invented certain new and useful Improvements in Elastic- FluidTurbines, of which the following is a specification.

The present invention relates to elastic fluid turbines such as comprisea plurality of bucket wheels mounted in spaced relation on a shaft withnozzle diaphragms between them which divide the turbine into stages.

In such turbines it is customary to provide bushin s on the shaftbetween the wheels, whic bushings serve to maintain the wheels incorrect spaced relation to each other. The nozzle diaphragms surroundthese bushings, a suitable packing being provided between the outersurfaces of the bushings and the bores of the diaphragms.

n operation, elastic fluid turbines are subjected to substantialtemperature changes when starting up, and when changes in load occur andit is found that the wheel hubs respond more quickly to these changesthan does the heavy shaft, and that they therefore expand more quickly.As a consequence there isa tendency for the hub to ex and along theshaft H he object of n iy invention an improved bus L for spac apartwhich is flex'i is to a so to permit of the unequal expansion of thewheel hubs and the shaft. r T I,

For a considers. of what I believe toj be novel and my invention,attentionis dispecification and rected to the accom anylng the claimsappende thereto.

In the drawing, the-figure is a radial sectional view of a portion of anelastic fluid.

turbine embodying my invention.

Referrin to the drawing, 1 indicates a turbine sha t'havin wheels2thereon which carry buckets 3. 4 indicates the turbine casing in whichare supported the nozzle diahragms 5. Located on the shaft 1 between t ehubs of the turbine wheels 2 are spacin bushings 6 and between thesurfaces of sue bushings and the bores of the nozzle diaphragms aresuitable paokings 7 conventional packings of the labyrinth type beingshown in the present instance. The bush in s 6 are in the form of ringsand are pro- 10 being squeezed in toward the central portions 9.

This arrangement has the advantage that it permits the wheel hubs toexpand equally in both directions and that when they contract thebushings will come back to their original positions. The wheels are thusmaintained correctlv spaced along the shaft and are prevented fromcreeping or being displaced longitudinally of the shaft.

In accordance with the provisions of the patent statutes, I havedescribed the principle of operation of my invention, together with theapparatus which I now consider to represent the best embodiment thereof;but I desire to have it understood that the apparatus shown is onlyillustrative and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is c 1. In an elastic fluid turbine, the combination of a shaft,wheels thereon, and bushingswhich are flexible in an axial directionlocated on the shaft between the wheels to space the wheels apart.

2. In an elastic fluid turbine, the combination of a shaft, wheelsthereon, and bushings which are located on the shaft between the wheelsto space the wheels apart, each bushing comprising a central portion andprising annular rings rovided with lgrooves which extend from t e boreradia y outward toward the outer surface.

4. Inan elastic fluid turbine, the combi- 5 nation of a shaft, wheelsthereon, and flexible bushings located on the shaft'between the wheelsto ace the wheels apart, said bushings comprising annular rings each ofwhich is provided with two grooves, one adjacent each end, which extendfrom the 10 lfJoI-e radially outward toward the outer sur- In witness.whereof, I have hereunto set my hand this 8rd day of December 1917.

OSCAR JUNGGREN.

